“The more logical you are in your approach to your sleep, the more you’re going to screw it up,” says sleep specialist Rafael Pelayo, MD. Pelayo is a clinical professor of psychiatry and behavioral sciences at the Stanford Center for Sleep Sciences and Medicine and the author of the forthcoming book How to Sleep, which publishes in December 2020. Today, Pelayo answers our most pressing sleep questions: What’s really happening when we’re dreaming? Why do we sleep? Can we “catch up” on sleep? How much sleep do kids need? What causes sleep to become dysfunctional or disordered? How much are you affected by the way your partner sleeps? What can we do to feel rested when we wake up? (For more, see The goop Podcast hub.)